Aww, that's adorable. I like to think that Luna used her influance as princess to make that possible. I seems to me that Luna is the kind of pony who would help people with her authority as princess (or just by asking nicely, whichever happens to be the case) just because she likes helping her artistically enclined subjects, especially foals like Sweetie Bell who have obvious potential tallent in a preforming art like Sweetie Bell does. Anyways, great work!